TW201016299A - Vapor recovery device - Google Patents

Abstract

To provide a vapor recovery device for oil feeding machine without adsorption agent with sufficient adsorption ability being desorbed and without gasoline vapor being discharged into the atmosphere through oversaturation of the adsorption agent. The vapor recovery device for oil feeding machine is characterized in that: a first pump is mounted to a recovery pipe communicating with openings at tip portions of oil feeding nozzles; the recovery pipe opens in a vapor/liquid separation chamber via a condensation tank; the vapor/liquid separation chamber is connected to a first or second adsorption tower; a second pump is mounted to a circulation pipe connected to the first or second adsorption tower; the circulation pipe is connected on a suction side of the first pump; and a control device switches between adsorption process and desorption process based on the quantity of fed oil.

Description

201016299 VI. Description of the Invention: [Technical Field of Invention] 3 Field of the Invention The present invention relates to a gasoline vapor which is disposed in a fuel supply station for supplying fuel oil to a vehicle and recovering fuel from a fuel tank of a vehicle. Vapor recovery unit. c Previously good winter]1 Background of the invention Fuel oil such as gasoline has high volatility. When oil is supplied to the fuel tank of a car, gasoline vapor proportional to the amount of oil supplied flows out of the fuel tank. When this gasoline vapor is released into the atmosphere, not only the resources are useless, but also the danger of fire caused by fire or environmental pollution. In order to cope with such drawbacks, a vapor recovery device is proposed which recovers the gasoline vapor flowing out of the fuel tank in the oil supply, cools and liquefies the gasoline vapor, and liquefies the gasoline vapor which cannot be liquefied to the adsorbent, and does not contain the gasoline vapor. The gas is released into the atmosphere (see Patent Document 1). Here, in the vapor recovery apparatus of the prior art (Patent Document 1), it is judged whether or not the adsorbent is saturated by the gasoline vapor, in other words, the adsorbent in the adsorption tower is performed in accordance with the sum of the oil supply times. Adsorption and switching of desorption (regeneration) of the adsorbent. However, the amount of oil supplied (flow rate) is not uniform at all fuel supply times, but there are cases where there is a large amount of flow in the oil supply and a case where the flow rate is reduced (the flow rate is small). For example, when the supply of oil in a large amount of supply is carried out for a long time, the amount of gasoline vapor generated is also increased, and the adsorbent is saturated in the section 201016299 before desorption of the adsorbent, and there is no adsorption of gasoline vapor. 'The gasoline vapor is released into the atmosphere. On the other hand, when the oil supply is reduced for a long period of time in which the supplied flow rate is reduced, there is a drawback in that the adsorption capacity of the adsorbent is sufficient to switch to the desorption step. [Patent Document 1] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. 4, No. 4, No. 4, the entire disclosure of the present invention is directed to the present invention, and the object of the present invention is to provide an adsorbent which does not have sufficient adsorption capacity. Under desorption, there is no supersaturation of the adsorbent, and the gasoline vapor is released to the vapor recovery device of the oil supply machine in the case of the big one. Means for Solving the Problem The vapor recovery device (13) of the present invention is characterized in that it has an oil supply system and a gasoline vapor recovery system, and the oil supply system has one end connected to the oil storage tank (1, 1R, 1H: underground tank) The other end is connected to the oil supply pipe (2) of the oil supply hose (?), the oil supply pump (5) installed in the oil supply pipe (2), and the flow meter (6), and the gasoline vapor recovery system has a vapor return pipe (recovery pipe 15, air supply pipe 30, circulation pipe 48, 48A) having an opening (17) near the fuel supply nozzle (8), a condensing device (condensation tank 2) installed in the vapor return pipe, And a desorption and desorption device (first and second adsorption towers) having a function of condensing and removing water vapor and gasoline vapor, and the adsorption desorption device (33, 34) is provided in the condensation device (20) a downstream side, and internally filled with a first or second adsorption tower (33, 34) of an adsorbent (35) having a control device (recovery control 201016299 14) 'The control device (14) has a flow rate Measuring the signal of (6) such that the i- or second adsorption tower (33, 34) is in the adsorbent (35) The adsorption step of adsorbing gasoline vapor and the function of switching the desorption step of desorbing the adsorbent (35) (the patent application scope item 1). The steam recovery device (13) of the present invention is preferably provided with an oil supply pump (5) and a flow meter (6) connected to the oil supply pipe (2) connected to the oil storage tank (1, 1R, 1H) for connection to the oil supply. The steam supply device (13) of the oil supply nozzle of the oil supply nozzle is provided at the front end of the oil supply hose (7) of the pipe (2), and the recovery pipe 15 of the opening (17) of the oil supply nozzle (8) is installed 1 fruit (19. Compression system), the recovery pipe (15) is opened in the gas-liquid separation chamber (21) by a condensing tank (2〇), and the gas-liquid separation chamber (21) is connected to the first and second adsorption towers. (33, 34) 'The second system (49: vacuum pump) is installed in the circulation pipe (48) connected to the first and second adsorption towers (33, 34), and the discharge side of the second pump (49) is used. The circulation tube (48A) is connected to the third pump. The inflow side of the %, and the adsorption of the adsorbent (35) for selectively adsorbing the gas-liquid separation chamber (21) to the first or second adsorption tower (33, 34) to adsorb the gasoline vapor into the adsorption tower And a step of selectively connecting the first or second adsorption towers (33, 34) to the second pump (49) to switch the desorption step of desorbing the gasoline vapor adsorbed to the adsorbent (35) The control unit (14) and the recovery control unit (14) switch the functions of the adsorption step and the desorption step in accordance with the amount of oil supplied by the flow meter (6) of the fuel dispenser (3). The gas-liquid separation chamber (21) is connected to the first adsorption tower (33) by a gas supply pipe (30) provided with an on-off valve (31), and an air supply pipe (30) provided with an on-off valve (32) Is connected to the second adsorption tower (34), and the first and second adsorption towers (33, 34) are connected to one end and are connected to the atmosphere, and an intake pipe (4〇) equipped with an on-off valve (38, 39) And an exhaust pipe 201016299 (4〇) which is open to the atmosphere and is equipped with an on-off valve (42, 43), and is connected to the circulation pipe of the first and second adsorption towers (33, 34) and the second pump (49). (48) Installing the on-off valve (46, 47) 'The control device (recovery control unit 14) has a function of switching the first adsorption tower (33) to the desorption step, and the second adsorption tower (34) When switching to the adsorption step, the on-off valve (31) is closed, the communication between the gas-liquid separation chamber (21) and the first adsorption tower (33) is blocked, the on-off valve (42) is closed, and the first adsorption tower (33) is discharged. The air pipe (44) is disconnected from the atmosphere, and the opening and closing valve (38) is opened, so that the first adsorption tower (33) communicates with the atmosphere through the suction pipe (40), and the switching valve (46) is opened by circulation. a tube (48) for connecting the first adsorption tower (33) to the suction of the second pump (49) With the side attached, the on-off valve (32) is opened to connect the gas-liquid separation chamber (21) with the second adsorption tower (34), and the on-off valve (43) is opened to make the second adsorption tower (34) pass the exhaust pipe (44). ), in communication with the atmosphere, closing the on-off valve (39), blocking the second adsorption tower (34) to communicate with the atmosphere through the suction pipe (40), closing the on-off valve (47), and blocking the second adsorption tower (34) In communication with the suction side of the second pump (49), when the ith adsorption tower (33) is switched to the adsorption step and the second adsorption tower (34) is switched to the detachment step, the on-off valve (31) is turned on to make the gas-liquid The separation chamber (21) is in communication with the first adsorption tower (33), and the opening and closing valve (42) is opened, and the first adsorption tower (33) is connected to the large emulsion by the exhaust pipe (44), and the on-off valve (38) is closed. The first adsorption tower (33) is blocked from being connected to the atmosphere by the suction pipe (40), and the on-off valve (46) is closed to interrupt the communication between the first adsorption tower (33) and the suction side of the second pump (49). The switch valve (43) is closed, and the second adsorption tower (34) is blocked by the exhaust pipe (44), communicates with the atmosphere, opens the on-off valve (39), and the second suction is made by the suction pipe (40). The tower (34) is in communication with the atmosphere, and the on-off valve (47) is opened, and the second adsorption tower (34) is made by the circulation pipe (48). It is in communication with the suction side of the second fruit (49). In the present invention, the control device (recovery control unit 14) preferably has the following function of 201016299, that is, performing gas-liquid separation of the second adsorption towers (33, 34), and steaming the gasoline V: selectively connected to the first 1 or the absorption of the agent 35 is connected to the second pump (49), so that the adsorbent (35) is selected to be mixed with the step of the step, and will be installed in the desulfurization of the oil vapor desorption (3 32, 38, 39, 42 4 attached to the tower (33, 34)

After the time (for example, 2 seconds), the switch controls the switches _, 32, 38, 39, 42, 43, 46, 47) (the second item of the patent application). Further, the above-mentioned (fourth) device (recovery control unit 14) preferably has the following function 'that is, in the sputum liquid separation chamber (21 brittlely connected to the first or second adsorption tower (33, 34)) An adsorption step of adsorbing the gasoline vapor to the adsorbent (35) in the adsorption tower (33, 34), and selectively connecting the third or second adsorption tower (Μ, 3 sentences to the second pump (49), When the desorption step of the gasoline vapor desorption by the adsorbent (35) is switched, the second pump (49) is stopped for a certain period of time (for example, 12 seconds). After the predetermined time elapses, the second pump is patented. In the third aspect of the invention, in the present invention, it is preferable to provide a pressure sensor (50, 51) in the air supply pipe (30) and the circulation pipe (48) connected to the adsorption towers (33, 34), and the foregoing control device (Recycling control unit 14) has a function of stopping the functions of the first and second pumps (19, 49) when the pressure measured by the pressure sensor (50, 51) exceeds a certain range (patent pending) Item 4) Or in the present invention, it is preferable to provide a cooling medium for measuring the aforementioned condensing device (condensation tank 20) (cold inside the condensing tank 2) The temperature sensor (28) of the temperature of the liquid 22 (the liquid temperature of the coolant 22) and the temperature sensor 201016299 for measuring the temperature of the outside air are one (four) set (the recovery control is based on the temperature sensing of the external air temperature) The measurement of the device (29) = the time required for the cooling of the medium (22), and the temperature of the media is higher than the reading value; =: the cooling device after the cooling (cooling machine 23) ^Cold section (4) Miscellaneous cold The oil supply machine (3) should be provided with a plurality of units, and the above-mentioned control device has the following functions 'ie' according to the number of oil supply machines (3) for oil supply (sending oil supply) The number of the fuel supply unit 3 of the signal of the main purpose), the ability to control the aforementioned

(The frequency of the inverter motor of the drive source) (Application of the invention) Effect of the invention The effects of the invention are as follows. (1) Since the switching between the adsorption step and the detachment step corresponds to the amount of oil supply, the residual effect can be prevented. In the state of many adsorption capacities, moving to the desorption step also prevents the adsorption capacity from being exceeded, and the adsorption step continues, ensuring the authenticity of '/V/recovery by steam, and preventing unnecessary adsorption/desorption steps. Switch.

(2) When switching the adsorption step and the desorption step, all the on-off valves are turned on only for a predetermined time (for example, 2 seconds), and after the pressure in the tube is uniform, the adsorption step/desorption step corresponding to the first and second adsorption columns is performed. The switching control of the on-off valve is performed, so that the switching operation of the on-off valve can be smoothly performed. (3) When the adsorption step and the desorption step are switched, the driving of the second pump is stopped only for a predetermined time (for example, 12 seconds), and after the amount of gasoline vapor in the adsorption tower of the desorption step is normal, the second pump is driven, so It is possible to prevent the case where only the gasoline vapor desorbed from the adsorption tower is supplied to the suction side of the first pump or the oil vapor desorbed from the adsorption tower is reversed to the oil supply side. (4) Since the pressure of the air supply pipe and the circulation pipe of the adsorption tower is outside a certain range, it is stopped and notified, so that the malfunction of the machine can be easily known, and the solidity of the vapor vapor recovery can be ensured. (5) Since the liquid temperature in the condensing tank is not below a certain temperature, it is stopped and notified, so that the malfunction of the cooling machine can be easily known, and the reliability of the gasoline vapor recovery can be ensured.

(6) When a plurality of oil feeders are connected to the vapor recovery device, the driving speed of the first pump is controlled according to the number of oil feeders in the oil supply, thereby preventing a large amount of air from being sucked in with the gasoline vapor, thereby preventing Almost inhale gasoline vapor. (7) By recovering gasoline vapor reliably, there is no waste of resources and it can prevent air pollution. I: Embodiment 3 Best Mode for Carrying Out the Invention Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 shows the entire oil supply unit provided with the vapor recovery device of the fuel dispenser of the present invention. An oil storage tank 1 is buried in the underground of the oil supply station, and the oil supply pipe 2 connected to the oil storage tank 1 is disposed in the casing 4 of the oil supply machine 3. In the casing 4, an oil supply pump 5 and a flow meter 6 are installed in the oil supply pipe 2, and an oil supply hose 7 is connected to the oil supply pipe 2. An oil supply nozzle 8 is provided at the front end of the oil supply hose 7. The oil supply nozzle 8 is attached to the nozzle hanger 9, and the nozzle switch 10 is provided to the nozzle hanger 9. The nozzle switch 10 outputs an activation signal when the fuel supply nozzle is separated from the nozzle hanger 9. 201016299 The oil supply control unit 11 is provided in the fuel dispenser 3. The oil supply control unit 11 is configured to receive a signal from the nozzle switch 10, drive the fuel supply pump 5, calculate a flow rate signal from the flow meter 6, display the fuel supply amount on the display 12, and transmit the signals to the vapor recovery device 13 for recovery. Control unit 14. The vapor recovery device of the oil dispenser 3 of the present invention is shown by reference numeral 13 in the entirety of Fig. 1. The entire mode of the vapor recovery device 13 of the fuel dispenser 3 is shown in Fig. 2. In Fig. 2, the gasoline vapor flowing out of the fuel tank of the automobile not shown in the figure is recovered by the recovery pipe 15. The recovery pipe 15 is attached to the oil supply soft 7 and communicates with the inside of the casing 16 of the vapor recovery unit 13 via the casing of the oil supply unit 3. One end of the recovery pipe 15 has an opening 17 at the front end of the oil supply nozzle 8. The recovery pipe 15 is provided with a check valve 18 and a compression pump 19 (first pump). The end of the recovery pipe 15 opposite to the fuel supply nozzle 8 is opened to the gas-liquid separation chamber 21 via the condensing tank 20. The cooling liquid 22 is filled in the condensing tank 20, and the cooling liquid 22 is cooled by the cooler 23. When the gasoline vapor and the water vapor flowing through the recovery pipe 15 flow in the condensing tank 20, they are condensed by heat exchange with the cooling liquid 22 to become water (liquid phase). In the gas-liquid separation chamber 21, the condensed water is separated from the liquefied gasoline and the gasoline vapor, and discharged to the outside of the vapor recovery unit 13 by the drain pipe 24. The liquefied gasoline is recovered to the oil feeder 3 or the oil sump 1 by the oil discharge pipe 25 of the gas-liquid separation chamber 21. In the second drawing, reference numeral 26 denotes a cock which is provided in the drain pipe 24. When the condensed water is stored in the gas-liquid separation chamber 21 by a certain amount, the cock 26 is opened and discharged to the outside of the vapor recovery unit 13. Reference numeral 27 is a screw plug provided in the drain pipe 25, and when the liquefied gasoline is stored in the gas-liquid separation chamber 21, the liquefied gasoline is sent to the fuel dispenser 3 or the oil sump 1 and the like. Further, the reference numeral 28 of Fig. 2 is a temperature sensor for measuring the temperature of the coolant 22, and the number 29 is a temperature sensor for measuring the temperature of the outside air. The gas supply portion connected to the gas layer portion of the gas-liquid separation chamber 21 (the region where the gas volume is stored) is divided into a tube equipped with the on-off valve 31 and a tube equipped with the on-off valve 32. The first adsorption tower 33 is connected to the first adsorption tower 33, and the tube in which the on-off valve 32 is mounted is connected to the second adsorption tower 34. The adsorbent 35 is filled in the ° and the additional towers 33, 34. The adsorbent 35 adsorbs with a good efficiency to select a material which is easy to desorb, for example, a gel or zeolite having a pore diameter of 4 to 100 angstroms. A cooling pipe 36 is disposed in the adsorption towers 33, 34, and the cooling pipe 36 communicates with the condensation tank 20. By the cooling of the cooling pump 37, the cooling liquid 22 in the condensing tank 2 is cooled in the cooling pipe 36 by the jade coating, thereby increasing the adsorption efficiency of the adsorbent 35. An intake pipe provided with an on-off valve 38 is connected to the lower portion of the adsorption tower 33, and an intake pipe provided with an on-off valve 39 is connected to the lower portion of the adsorption tower 34. Here, the suction pipe having the on-off valve 38 and the suction pipe provided with the on-off valve 39 are connected to the suction pipe which is different from the Wei (4) of the atmosphere, and the contraction device 41 is installed in the suction pipe 40. 11 201016299 On the other hand, 'the _ tower 33 is loaded with the money and the milk eliminator e is connected to the upper part of the yakisaki 34. ^ The exhaust pipe of the switch room 4 and the exhaust pipe provided with the shut-off valve 43 are combined to form the exhaust pipe 44. The end portion of the exhaust pipe 44 in which the discharge chamber 4 is installed is connected to the atmosphere side. Further, a circulation pipe in which the switch valve 47 is attached to the upper portion of the adsorption tower 33 is connected to the upper portion of the adsorption tower 33. Loading

The circulation pipe provided with the on-off valve 46 and the circulation pipe provided with the on-off valve 47 merge to form a circulation pipe 48. The mouth machine is provided with a vacuum pump 49 in the circulation pipe 48, and the circulation pipe 48 is connected to the suction side of the vacuum pump 49 (second pump). The circulation pipe 48A connected to the discharge side of the vacuum pump 49 is connected to the junction B1 of the region on the suction side of the compression pump 19 in the recovery pipe, and merges with the recovery pipe 15. In Fig. 2, reference numeral 50 denotes a pressure sensor for measuring the pressure in the air supply tube 3''.

Further, reference numeral 51 of Fig. 2 shows a pressure sensor for measuring the pressure in the circulation pipe 48. In Fig. 2, the recovery pipe 15, the air supply pipe 3, the circulation pipe 48, and the unsealing pipe 48A constitute a vapor return pipe. The machine associated with the control of the vapor recovery unit 13 of the fuel dispenser 3 is shown in block diagram in Figure 3. In Fig. 3, the oil supply control unit u of the oil supply unit 3 has a function of receiving the opening-closing signal of the nozzle closing 10 and the flow rate signal of the flow meter 6, and the function of the 12 201016299 dynamic signal output to the oil supply pump 5 is provided. The function of the oil quantity display signal output to the display 12. In Fig. 3, the recovery control unit 14 of the vapor recovery unit 13 has a function of receiving a pressure signal of the pressure sensors 50, 51 of the temperature signals of the temperature sensors 28, 29 and a function of receiving a timing signal from the timer TM. . Further, the recovery control unit 14 of the vapor recovery device 13 has a function of outputting a switch control signal (switching signal) to the switching valves 3, 32, 38, 39, 42, 43, 46, 47. The recovery control unit 14 has a function of outputting a drive signal to the pumps 19, 37, and 49, a function of outputting a drive signal to the cooler 23, and a function of outputting a notification signal to the notifier 52. The oil supply control unit 11 and the recovery control unit 14 are connected by information, and mutually transmit and receive control signals. In other words, the fuel supply control unit 11 of the fuel dispenser 3 inputs a flow rate signal of the flow meter 6, that is, a signal of the fuel supply amount, to the recovery control unit 14 of the vapor recovery device 13. Next, the action of the vapor recovery device 13 of the oil feeder will be described with reference to Figs. 2 and 3. When the oil supply station is in operation, the cooler 23 is driven to cool the cooling liquid 22 in the condensing tank 20 to a constant temperature (e.g., 5 ° C or lower). The cooled coolant 22 cools the adsorbent 35 in the adsorption columns 33, 34. Here, the first adsorption tower 33 adsorbs gasoline vapor (adsorption step), and desorbs (or regenerates) the adsorbent material filled in the second adsorption tower 34 (desorption step). At this time, the on-off valves 31, 39, 42, 47 are open, and the on-off valves 32, 38, 43, 46 are closed. 13 201016299 Here, when one of the adsorption towers performs adsorption of gasoline vapor, in another adsorption tower, desorption (or regeneration) of the adsorbent filled inside is performed. In order to supply the gasoline to the automobile and the oil supply nozzle 8 is detached from the nozzle hanger 9, the nozzle switch 10 is activated to transmit an activation signal. The oil supply control unit 11 that receives the start signal drives the fuel supply pump 5, and transmits a signal for the purpose of oil supply to the recovery control unit 14 of the vapor recovery device 13. The recovery control unit 14 that receives the signal of the fuel supply from the oil supply control unit 11 drives the compression pump 19. The fuel supply nozzle 8 is inserted into a fuel tank of a vehicle (not shown), and when the oil supply is started, the gasoline in the oil storage tank 1 is pumped by the oil supply pump 5, and is discharged from the fuel supply nozzle 8 to the fuel of the automobile not shown. Inside the slot. At this time, the amount of oil measured by the flow meter 6 is displayed on the display 12, and at the same time, the fuel supply amount signal of the measurement result of the flow meter 6 is sent to the recovery control unit 14 of the vapor recovery device 13. When the oil is supplied, the gasoline vapor flows out of the fuel tank of the automobile (not shown), and the gasoline vapor that has flowed out flows into the recovery pipe 15 from the opening 17 of the recovery pipe 15 by the action of the compression pump 19. The gasoline vapor that has flowed into the recovery pipe 15 is cooled in the condensing tank 20 and is almost completely liquefied. The liquefied gasoline is accumulated in the lower portion of the gas-liquid separation chamber 21, and is returned to the oil feeder 3 or the oil sump 1 by the drain pipe 25. The gasoline vapor that has not been liquefied in the condensing tank 20 flows through the air supply pipe 30, and flows into the first adsorption tower 33 via the on-off valve 31. Further, the gas which has flowed into the adsorption tower 33 is pressurized to about 250 kPa by the compression pump 19. The gasoline vapor that has flowed into the first adsorption tower 33 is adsorbed by the adsorbent 35 in the adsorption tower 33, and the gas discharged from the first adsorption tower 33 becomes a gas containing no gasoline vapor. This gas (gas containing no gasoline vapor) is released from the exhaust pipe 44 to the atmosphere via the on-off valve 42, release 201016299. In this way, the large amount of the automobile vapor that has flowed out of the fuel tank of the automobile during the oil supply is condensed and liquefied by the condensing tank 2 of the vapor recovery device 13, and is recovered by the gas knife to the 21st. The gasoline vapor liquefied in the condensing tank 20 is adsorbed and recovered by the adsorbent 35 of the adsorption tower 33. The gasoline vapor adsorbed by the adsorption tower 33 is taken off from the adsorbent 35 in the desorption step at the adsorption tower 33, and is attracted by the circulation valve 48 via the on-off valve 46. The gasoline vapor discharged from the vacuum pump 49 flows to the suction side of the compression pump 19 through the circulation pipe 48A and the junction point B1'. That is, the gasoline vapor is recovered without leaking out to the fuel dispenser 3. Next, the switching of the adsorption/desorption of the first adsorption tower 33 and the second adsorption tower 34 will be described with reference to Fig. 4. In the description relating to FIGS. 4 to 6 (description of the switching of adsorption/desorption of the adsorption towers 33 and 34), the first adsorption tower 33 is switched from the step of adsorbing gasoline vapor (adsorption step) to the filling. The internal adsorbent de-energization (de-inching step) is explained by the case where the second adsorption tower 34 is switched from the desorption step to the adsorption step. In the figure, in step ST1, the recovery control unit 14 of the vapor recovery unit 13 determines whether or not the fuel supply amount signal has been input from the fuel supply control unit U of the fuel dispenser 3, in other words, whether it is in the oil supply. When the right fuel supply control unit 11 inputs the fuel supply amount signal to the recovery control unit 14 (YES in step ST1), the fuel supply amount is obtained (the adsorption of the adsorption tower 33 34 is performed last time / The sum of the oil supply amounts after the desorption is switched (step ST2). 15 201016299 Then, it is determined whether or not the integrated value obtained in step ST2 is equal to or larger than the threshold (step ST3). Here, the threshold value is an integrated value of the fuel supply amount, and the adsorbent 35 in the first adsorption tower 33 is sufficiently adsorbed into oil vapor, and is set to a value close to the saturated state (for example, 500 liters). When the integrated value is equal to or higher than the threshold (YES in step ST3), the first switch column 33 that has performed the adsorption step is controlled to perform the desorption step, and the second adsorption column 34 that has performed the desorption step performs the adsorption step ( Step § Τ 4). Then, the integrated value of the fuel supply amount (the integrated value obtained in step ST2) is calculated (step ST5). 〇 When the integrated value is less than the threshold value in step ST3 (NO in step ST3), the process returns to step ST1. In step ST4, the first adsorption tower μ that has performed the adsorption step is the desorption step, the second adsorption tower 34 that has performed the desorption step is the adsorption step, and in the second diagram, the on-off valves 31, 39, 42 are used. 47 is closed, and the on-off valves 32, 38, 43, and 46 are opened. By the switch control of the on-off valve, the gasoline vapor which is not liquefied in the condensing tank 20 is supplied to the second adsorption tower 34 through a tube in which the gas supply pipe 30 and the on-off valve 32 are provided. The gasoline vapor is adsorbed by the adsorbent 35 in the adsorption tower 34, and the air containing no gasoline vapor is released from the exhaust pipe to the atmosphere. On the other hand, the first adsorption tower 33 is connected to the vacuum pump 49 by a tube in which the on-off valve 46 is provided and a circulation pipe 48. By driving the vacuum pump 49, a negative pressure acts on the inside of the first adsorption tower 33, and the gasoline vapor adsorbed by the adsorbent 35 is attracted by the true fruit 49, and the adsorbent is desorbed. 16 201016299 Referring to Fig. 2, the second adsorption tower 33 will be described in further detail. By driving the vacuum pump 49, the gas in the first adsorption tower 33 is vacuum suctioned by the vacuum pump 49. Here, since the on-off valve 38 is opened, the air which is restricted by the contraction means 41 flows from the intake pipe 40 to the first adsorption tower 3 3 which is evacuated by the vacuum pump 49. As a result, the inside of the first adsorption tower 33 is a negative pressure of a negative pressure, for example, -30 kPa, and the gasoline vapor adsorbed by the adsorbent 35 in the first adsorption tower 33 is also sucked by the vacuum pump 49. 7 The gasoline vapor discharged from the vacuum is cooled by the circulation pipe 48A, the junction point B1, the compression pump 19, and the recovery pipe 15, and is condensed by the condensation tank 20. Further, since the recovery pipe 15 is provided with the stop (four) 18, the gasoline vapor does not flow out from the opening 17 of the nozzle 8 to the atmosphere. ^ In addition, in order to perform the adsorption step of the second adsorption column 33 which has undergone the desorption step, the second adsorption column 34 which has undergone the ° and the additional steps performs the desorption step, opening the switches 31, 39, 42, 47 ' When the switching valves 32, 38, 43, and 46 are turned off, the switching valves 31, 32, and 38 of the step ST4 are switched when the adsorption/desorption of the first adsorption tower 33 and the second adsorption tower 34 shown in Fig. 4 is performed. When the integrated value of the fuel supply amount obtained in step ST7 is equal to or greater than the threshold value (YES in step ST3), the switch can be switched instantaneously. However, when the switching state of the on-off valve is instantaneously switched, the positive and negative pressures of the on-off valve act simultaneously, and it is difficult to perform a true opening or closing. For example, when the adsorption tower 34 is switched from the desorption step to the adsorption step, when the switches of the switching valves 31, 32, 38, 39, 42, 43, 46, 47 are instantaneously opened, the vacuum valve 49 is provided at the switching valve 47'. The side negative pressure (e.g., -3 kPa left 17 201016299 right) acts simultaneously with the positive pressure (e.g., 250 kPa) of the compression pump 19 acting in the adsorption column 34. When the positive and negative pressures of the on-off valve 47 act simultaneously, there is a case where the switch valve 47 to be closed is not completely closed. In order to prevent the positive and negative pressures of the on-off valve from acting at the same time, in the embodiment shown in the figure, when switching between the adsorption step and the desorption step, the switching of the on-off valve is not instantaneously performed, and the fifth diagram is executed. The control shown in the flowchart. Referring to Fig. 5, the switches of the on-off valves 31, 32' 38, 39, 42, 43, 46, 47 will be described. The control shown in the flowchart of Fig. 5 is in step ST4 of Fig. 4, the first adsorption tower 33 is switched from the adsorption step to the desorption step, and the second adsorption tower 34 is switched from the desorption step to the adsorption step. . Therefore, in Fig. 5, it is first determined in step ST21' whether or not the state in which the switching of step ST4 of Fig. 4 is to be performed is performed. When the first adsorption tower 33 is switched from the adsorption step to the desorption step, and the second adsorption tower 34 is switched from the desorption step to the adsorption step (YES in step ST2i), all the on-off valves 31, 32, 38, 39, 42, 43, 46, 47 Open the 'simultaneous' start timer TM (refer to Fig. 3) (step ST22). Here, the timing of the timer TM is performed by opening all of the on-off valves 31, 32, 38, 39, 42, 43, 46, 47 only for a certain period of time (for example, 2 seconds). Therefore, in step ST23, it is determined whether or not the time counted by the timer TM is the predetermined time (2 seconds). If the timer TM is timed, in other words, the on-off valves 3丨, 32, 201016299 38, 39, 42, 43, 46, 47 are all open for a certain period of time (2 seconds) (YES in step ST23) 'OFF switch The valves 31, 39, 42, 47 are opened and closed 32, 38, 43, 46 (step ST24). Thereby, the first adsorption tower 33 can perform a desorption step, and the second adsorption tower 34 can perform an adsorption step. When the switch control of step ST24 ends, 'return to step ST21 (step

ST25). In step ST21, in the control of Fig. 4, step ST21 executes NO.

The loop is until the execution of step ST4, that is, the adsorption and desorption are switched. In the control shown in Fig. 5, in step ST22, all of the on-off valves 31, 32, 38, 39, 42, 43, 46, 47 are opened only for a certain period of time (for example, 2 seconds) to include the first adsorption tower 33. The pressure of the tube system and the tube system including the second adsorption tower 34 is equalized. In the state where the pressure of the tube system including the first adsorption tower 33 and the tube system including the second adsorption tower 34 is equal, the 'dib and the attached tower 33 can perform the desorption step even if the second adsorption tower 34 performs the desorption step. , switch on/off valve, in the switch room 39, 42, 43, 46, 47, positive pressure and negative pressure can not be turned at the same time, the switch operation between _ can be performed smoothly and surely, and can improve the opening _ switch control t-knife When changing the switching state of the on-off valve, in addition to the upper β (in the case where the positive and negative pressures of the switching valve act simultaneously, it is not smooth;::: the switching control, but the problem of the state of lack of reliability), ^ the following The drawbacks of the flaws. 'There is a process as described above, when the first adsorption column 33 is switched from the adsorption step to the desorption step, and the second adsorption column 34 is switched from the desorption step to the adsorption step, the negative 19 of the process 19 201016299 is pressed against the fully adsorbed gasoline vapor. When the first adsorption tower 33 acts instantaneously, from the first! The adsorbent 35 in the adsorption tower 33 attracts a large amount of gasoline vapor to the vacuum pump. The gasoline vapor sucked by the vacuum pump is discharged by the vacuum pump 49, and is merged into the recovery pipe 15 by the circulation pipe 48A and the junction point B1. That is, when the switching state of the on-off valve is instantaneously switched, after the switching, the high concentration and a large amount of "gasoline vapor" discharged from the vacuum pump 49 are supplied to the suction side of the compression pump 19.

When this occurs, the suction valve 19 is sucked from the opening 17 of the oil supply nozzle 8 and the amount of gasoline vapor sent to the condensing tank 20 is reduced. Alternatively, there is a high concentration and a large amount of gasoline vapor discharged from the true & pump 49 flows back to the open side of the oil supply nozzle 8. Such a drawback is reflected in the embodiment shown in the figure by performing the control shown in Fig. 6. Fig. 6 is controlled by the flow chart shown in the flow chart at step ST4 of Fig. 4, and the second and second columns 33 are switched from the adsorption step to the desorption step, and the second adsorption column 34 is switched from the desorption step to the adsorption step.

Therefore, in the sixth drawing, first, in step ST26, it is determined in the same manner as the control of Fig. 5 whether or not the state in which the step ST4 of Fig. 4 is to be switched is performed. When the first adsorption tower 33 is switched from the adsorption step to the desorption step, and the 2° and the attached column are switched from the desorption step to the adsorption step (YES in step ST26), the vacuum pump 49 is stopped, and the timer is started. Timing of TM (step ST27) In step ST28, it is judged whether or not the time counted by the timer TM, that is, the time when the vacuum pump 49 is stopped, has elapsed for a certain period of time (for example, 12 seconds). When a certain 20 201016299 time (12 seconds) has elapsed (YES in step ST28), the driving of the vacuum pump 49 is started', and the timer 重 is reset (step ST29). Then, it returns to step ST26. When returning to ST26, step ST26 is executed as the NO loop until the control in Fig. 4 is executed, and step ST4 is executed, that is, the adsorption and desorption are switched. In the control shown in Fig. 6, the first adsorption tower 33 is switched from the adsorption step to the desorption step, and the second adsorption tower 34 is switched from the desorption step to the adsorption step, and the vacuum pump 49 is stopped only for a certain period of time ( For example 12 seconds) 'On this time only the compression pump 19 is driven. While the vacuum pump 49 is stopped, only the compression pump 19 is driven, and the first adsorption tower 33 is moved to the desorption step, and only the suction pressure on the suction side of the compression pump 19 acts, corresponding only to the suction pressure on the suction side of the compression pump 19. The amount and concentration of the gasoline vapor are merged into the recovery pipe 15 by the circulation pipe 48, the vacuum pump 49, the circulation pipe 48A, and the junction B1. Therefore, a large amount of high-concentration vapor vapor is not attracted from the first adsorption tower 33. Here, during a certain period of time (12 seconds), the gasoline vapor of a certain degree is desorbed from the first adsorption tower 33 by the negative pressure on the suction side of the compression pump 19, so even after a certain period of time, even if the vacuum pump is driven 49, a high concentration and a large amount of gasoline vapor is not discharged from the vacuum pump 49. Thus, by performing the control shown in Fig. 6, it is possible to prevent the disadvantage that the amount of gasoline vapor which is sucked from the opening 17 of the fuel supply nozzle 8 by the compression pump 19 and is sent to the condensing tank 2 is reduced, and the high concentration discharged from the vacuum pump 49. And a large amount of gasoline vapor flows back to the side of the opening 17 side of the oil supply nozzle 8. Next, referring to Fig. 7, a control for detecting the failure of the cooler 23 is made. In Fig. 7, first, it is determined whether or not the power of the cooler 23 is activated (step ST31). 'When the power is turned on (YES in step ST31), the recovery control unit ι4 receives the outside air temperature signal from the temperature sensor 29 (step ST32). ). Next, in step ST33, the recovery control unit 14 sets the time during which the coolant in the condensing tank 20 is cooled to a constant temperature or less based on the input external air temperature signal. At this time, if the outside air temperature is 30 ° C, it is set to 60 minutes, and if the outside air temperature is 2 ° ° C, it is set to 30 minutes. At the same time, the measurement of the timer tm is started at step s T33 '. In step ST34, it is judged whether or not the time for cooling the coolant 22, i.e., the time counted by the timer TM, has elapsed. When the coolant 22 has cooled down to the set time (YES in step ST34), the liquid temperature signal of the coolant 22 measured by the temperature sensor 28 is input to the recovery control unit 14 (step ST35). In step ST36, it is judged whether or not the measurement result of the temperature sensor 28 (the liquid temperature of the coolant 22) is below a certain temperature (threshold value). When the liquid temperature of the coolant 22 is equal to or lower than the threshold (YES in step ST36), it is determined that the cooler 33 is normally driven, and the routine proceeds to step ST37. In step ST37, it is judged whether or not the power source is OFF. If the power source is not turned off (NO in step ST37), the flow returns to step ST35. On the other hand, when the power is turned off (YES in step ST37), the control is ended. In step ST36, when the cooling liquid 22 has not reached a certain temperature or less after a certain period of time has elapsed (NO in step ST36), it is determined that an abnormality has occurred in the cooling system or the like, the cooling is stopped, the notifier 52 is actuated, and the cooling system is notified. Abnormal (step ST38). 201016299 Here, even if the coolant 22 falls below a certain temperature (threshold value) (YES in step ST36) 'When the step § Τ 37 is the loop of NO, when the liquid temperature of the coolant 22 rises above the threshold (steps) ST3^N〇), the cooler 23 is stopped, and the notifier 52 is actuated (step ST38). According to the control of Fig. 7, due to the abnormality of the notification cooling system, the abnormality can prevent the gasoline vapor from flowing into the adsorption towers 33, 34 without being condensed or liquefied by the condensing tank. As a result, the adsorption amount of the adsorption towers 33, 34 can be prevented from being abnormally increased, and the adsorbent is saturated at the stage before the adsorption/desorption is switched, and the gasoline vapor is released from the exhaust pipe 44 to the atmosphere. Next, referring to Fig. 8, a description will be given of a control for abnormality of the system including the adsorption tower (first adsorption tower 33) for performing the adsorption step at the time of gasoline vapor recovery. In Fig. 8, the recovery control unit 14 determines whether or not the signal of the fuel supply is input, in other words, whether or not the fuel is supplied (step ST41). When the signal of the fuel supply is received (YES in step ST41), the compression pump 19 is driven, and the timer TM is started (step ST42). After the compressor TM is driven, the recovery pipe 15, the gas-liquid separation chamber 21, the air supply pipe 30, the adsorption tower 33 in the adsorption step, and the exhaust pipe 44 are stabilized for a certain period of time (for example, 10 seconds). Whether or not it passes (step ST43). When the compression pump 19 is driven, when a certain period of time (for example, 1 second) is elapsed (YES in step ST43), the pressure signal indicating the measurement result of the pressure sensor 50 is input to the recovery control unit 14 (step ST44). In step ST45, it is judged whether or not the pressure measured by the pressure sensor 50 is within a certain range of 23 201016299, for example, 15 kPa to 250 kPa. When the pressure measured by the pressure sensor 50 is within a certain range (15 kPa to 2 s OkPa) (YES in step ST45), it is judged that the pressure of the system including the first adsorption tower 33 is normal. Returning to step ST41, the control of Fig. 8 is repeatedly performed. On the other hand, in step ST45', when the pressure measured by the pressure sensor 5 is outside a certain range (NO in step ST45), if it is lower than i5 kPa, the failure of the compression pump 19 is generated, and the recovery pipe is broken. The clogging of 15 and other abnormalities are in a state where the pressure of the system including the first adsorption tower 33 is not increased. On the other hand, when the pressure measured by the pressure sensor 50 is higher than 25 kPa, it is determined that the pressure of the system including the first adsorption tower 33 abnormally rises due to clogging of the adsorption tower 33 or the exhaust pipe 44. In either case, the compression pump 19 is stopped, and the notifier 52 notifies the abnormality (step ST46). Next, with reference to Fig. 9, the control for detecting the abnormality of the system in which the adsorption tower (e.g., adsorption tower 34) for performing the desorption step is installed will be described. In Fig. 9, the recovery control unit 14 determines whether or not the vacuum pump 49 has been driven (step ST51), and when the vacuum pump 49 has been driven (step 8: ¥8), the timer of the Lu timer TM is started (step ST52). Here, the timer TM is timed after determining whether or not the pressure in the adsorption tower 34 and the circulation pipe 48 in the desorption step is stabilized for a certain period of time (for example, 1 sec) after the vacuum pump 49 is driven. In step ST53, it is judged whether or not the time counted by the timer tm has passed the aforementioned certain time (for example, 10 seconds), and when a certain time (1 sec) has elapsed (YES in step ST53), it will correspond to measurement by the pressure sensor 51. The pressure of the pressure. 24 201016299 The signal is input to the recovery control unit 14 (step ST54). In step ST55, it is determined whether or not the pressure measured by the pressure sensor 51 is within a certain range (e.g., -1 〇 kPa to _5 kPa). When the pressure measured by the pressure sensor 51 is a value within a certain range (step 8755 is 8£8), it is judged that the system for arranging the adsorption tower 34 performing the detachment step is normal. Returning to step ST5 1, the control of Fig. 9 is repeatedly performed. In step ST55, when the pressure measured by the pressure sensor 51 exceeds a certain range (for example, -10 kPa to -50 kPa) (NO in step ST55), if it is lower than -50 kPa, it is judged to be due to the suction pipe 4 or the adsorption tower. The blockage of 34 or the like, the system including the adsorption tower 34 is abnormally decompressed. On the other hand, when the pressure measured by the pressure sensor 51 is higher than _1 kPa, it is judged that the system including the adsorption tower 34 cannot be decompressed due to a failure of the vacuum pump 49 or the like. In either case, the vacuum pump 49 is stopped, and the notifier 52 notifies the abnormality (step ST56). In the embodiment shown in the drawings, it is also possible to treat the gasoline vapor of one fuel dispenser 3 by the vapor recovery unit 13, or to treat the gasoline vapor of the plurality of fuel dispensers 3 by the vapor recovery unit 13. When the steam of the plurality of oil feeders 3 is processed by one vapor recovery unit 13, the signals are transmitted by the oil supply control unit 11 of each fuel dispenser 3 and the recovery control unit 14 of the vapor recovery unit 13 in accordance with the oil supply. The number of the oil feeders 3 controls the driving of the compression pump 19. Here, the drive control can be easily performed by the inverter motor (not shown) driving the compression pump 19'. When one steam recovery unit 13 treats the steam of a plurality of oil supply units 3, the control of the driving of the compression pump 19 is mainly described with reference to Fig. 10. In Fig. 10, in step ST61, the recovery control unit 14 of the vapor recovery device 13 receives a signal indicating the purpose of the oil supply from the oil supply control unit 11 of each fuel dispenser 3. The recovery control unit 14 determines whether or not a signal indicating the purpose of the fuel supply is received from only one fuel dispenser 3 (step ST62). In step ST62, when only the signal indicating the purpose of the oil supply is received from one of the oil dispensers 3 (YES in step ST62), the compression pump 19 is driven at a normal capacity (step ST63). On the other hand, when a signal indicating the purpose of the fuel supply is received from the plurality of oil dispensers 3 (NO in step ST62, YES in step ST64), the compression pump 19 is driven at a high speed (step ST65). When the signal of the fuel supply is not input from any of the oil dispensers 3 (NO in step ST62, YES in step ST64), the process returns to step ST61. Here, when the compression pump 19 (not shown) is driven by the inverter motor, when the compression pump 19 is driven at a normal capacity in step ST63, the inverter motor is driven at a frequency of 50 Hz. On the other hand, in step ST65, when the compression pump 19 is driven at a high speed, the inverter motor is driven at 70 Hz. Since the driving frequency of the inverter motor is changed, the capacities of the compression pump 19 are different in steps ST63 and ST65. In this manner, when one gasoline recovery unit 13 treats the gasoline vapor of one fuel supply unit 3 and one steam recovery unit 13 treats the gasoline vapor of the plurality of oil supply units 3, the output of the compression pump 19 is switched (or Capacity), whereby the gasoline vapor flowing out of the fuel tank not shown in the figure can be recovered at a good efficiency of 201016299. As shown in Figures 11 and 12, the oil supply devices 3A, 3B can supply gasoline of different oil types, and can also provide ordinary gasoline and high-octane gasoline, which are produced from a fuel tank of a vehicle not shown. Gasoline vapor also has two kinds of steam for ordinary gasoline and steam for high-octane gasoline. In the embodiment shown in the figure, as shown in Fig. 11, the gasoline vapor and the high-octane gasoline vapor are also recovered by a single vapor recovery unit 13, and the recovered gasoline vapor is returned to the ordinary by the recovery system RR. Ordinary gasoline fuel supply system for gasoline storage tank 1R or oil storage tank 1R. This is because even if the vapor of the high-octane gasoline is returned to the supply side of the normal gasoline (the oil storage tank 1R or the ordinary gasoline fuel supply system), there is no problem of contamination. However, as shown in Fig. 12, a vapor recovery unit 13 R for general gasoline and a vapor recovery unit 13 for high-octane gasoline may be provided. In Fig. 12, the recovery system RR of the gasoline recovery unit 13R for ordinary gasoline is returned to the ordinary gasoline fuel supply system of the ordinary gasoline storage tank 1R or the oil storage tank 1R, and the recovery of the high-octane gasoline special steam recovery unit 13 The system RH is returned to the high octane oil storage tank 1 or the high octane gasoline fuel supply system of the oil storage tank 1 . The other configurations and operational effects of the vapor recovery devices 13, 13R, and 13 of Figs. 11 and 12 are the same as those of the first to tenth embodiments. The embodiments shown in the drawings are merely illustrative, and the appended claims are not intended to limit the scope of the invention. Brief Description of Drawing C 3 27 201016299 Fig. 1 is a schematic view showing the supply of the steam recovery device of the fuel dispenser of the present invention. Fig. 2 is a block diagram showing a first embodiment of the present invention. Figure 3 is a block diagram of a machine showing the control of the vapor recovery unit of the fuel dispenser. Fig. 4 is a flow chart showing the switching control of adsorption/desorption in the first embodiment. Fig. 5 is a flow chart showing the switching control of the on-off valve for the adsorption/desorption switching of the first embodiment. Fig. 6 is a flow chart showing the control of the vacuum pump for the adsorption/desorption switching in the first embodiment. Fig. 7 is a flow chart showing the failure judgment control of the cooler of the first embodiment. Fig. 8 is a flow chart showing the abnormality detection control of the system in which the adsorption tower for carrying out the adsorption step of the first embodiment is mounted. Fig. 9 is a flow chart showing the abnormality detection control of the system in which the adsorption tower for performing the desorption step of the first embodiment is mounted. Figure 10 is a flow chart showing the drive control of a compression pump with a plurality of oil feeders. Figure 11 is a block diagram showing the state of normal gasoline vapor and high octane gasoline vapor recovered by the same vapor recovery unit. Fig. 12 is a block diagram showing the state in which the vapor of the normal gasoline and the vapor of the high-burning gasoline are separately recovered by a dedicated vapor recovery device. [Main component symbol description]

201016299 1.. . Oil storage tank 1R... Ordinary gasoline oil storage tank 1H... High octane oil storage tank 2.. Oil supply pipe 3.. Oil supply machine 3A... Oil supply device 3B... Oil supply device 4.. . Housing 5.. Oil supply system 6.. Flow meter 7.. Oil supply hose 8.. Oil supply nozzle 9.. Nozzle hanger 10... Nozzle switch 11.. Oil supply control unit 12.. Display 13.. Vapor recovery unit 13R... Vapor recovery unit 13H... Vapor recovery unit 14: Recycling control unit 15.. Recycling tube 16: . Housing 17 · · · Opening 18 .. . Check valve 19 .. Compressor pump 20 .. . Condensation tank 21.. Gas-liquid separation chamber 22 .. Coolant 23 .. Cooler 24 .. Drain pipe 25.. .Draining pipe 26.. cock 27.. cock 28.. Temperature sensor 29.. Temperature sensor 30.. Air supply pipe 31.. Switch valve 32.. Switching valve 33.. 1st adsorption tower 34... 2nd adsorption tower 35.. adsorbent 36.. Cooling tube 37.. Cooling pump 38.. Switching valve 39.. Switching valve 40.. Suction tube 41.. Shrinking tool 42.. Switching valve 29 201016299 43... Switching valve 52...Notifier 44...Exhaust pipe B1...Combination point 45...Release valve RR ...recovery system 46...switching valves ST1 to ST5...steps 47... Switching valves ST21 to ST29·. Step 48: Cycle pipes ST31 to ST38·. Step 48A...Circulation pipes ST41 to ST46...Step 49: Vacuum pumps ST51 to ST56··. Step 50 ··· Pressure sensor 51.·· Pressure sensor ST61~ST65··.Step

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Claims (1)

201016299 VII. Patent application scope: 1. A vapor recovery device, characterized in that it has an oil supply system and a gasoline vapor recovery system. The oil supply system has one end connected to the oil storage tank and the other end connected to the oil supply hose. a fuel pipe, an oil supply pump installed in the oil supply pipe, and a flow meter, the gasoline vapor recovery system has a vapor return pipe having one end open near the oil supply nozzle, a condensation device installed in the vapor return pipe, and adsorption and desorption a device having a function of condensing and removing water vapor and gasoline vapor, the adsorption and desorption device having a first or second adsorption tower disposed on a downstream side of the condensation device and filled with an adsorbent therein, the vapor recovery The apparatus further includes a control device having a function of switching the first or second adsorption tower in the adsorption step of adsorbing the gasoline vapor by the adsorbent and the desorption step of desorbing the adsorbent according to the measurement signal of the flow meter. 2. The vapor recovery device according to claim 1, wherein the control device has a function of selectively connecting the gas-liquid separation chamber to the first or second adsorption tower to adsorb gasoline vapor to The adsorption step of the adsorbent in the adsorption tower and the step of selectively connecting the first or second adsorption tower to the second pump to desorb the gasoline vapor adsorbed by the adsorbent, and then installing it in the desorption step of desorbing the gasoline vapor adsorbed by the adsorbent All of the on-off valves connected to the tubes of the adsorption tower are opened, and after a certain period of time, the switches control the on-off valves. 3. The vapor recovery device of claim 1, wherein the control device has a function of selectively connecting the gas-liquid separation chamber to the first or second adsorption tower to adsorb gasoline vapor to The adsorption step of the adsorbent in the adsorption tower and the step of selectively connecting the first or second adsorption tower 31 201016299 to the second pump to desorb the desorption step of the gasoline vapor adsorbed by the adsorbent The second pump is stopped for a predetermined period of time, and after the predetermined time elapses, the second pump is driven. 4. The vapor recovery device of claim 1, wherein a pressure sensor is disposed in the air supply pipe and the circulation pipe connected to the adsorption tower, and the foregoing control device has the following functions, that is, measurement by a pressure sensor When the pressure exceeds a certain range, the first and second pumps are stopped. 5. The vapor recovery device of claim 1, wherein a temperature sensor for measuring a temperature of a cooling medium of the condensation device and a temperature sensor for measuring an outside air temperature are provided, and the control device has the following functions: That is, according to the measurement result of the temperature sensor for measuring the temperature of the outside air, the time required for cooling the cooling medium is determined, and when the temperature of the cooling medium after the required time passes is higher than the threshold, the cooling is stopped. Media cooling device. 6. The vapor recovery device of claim 1, wherein the oil supply device is provided with a plurality of stages, and the control device has the following function, that is, controlling the first pump according to the number of oil supply machines for supplying oil Ability. 32